@shortstories - I voted 15-18.
If I had a magic wand though, I would cripple the power of the state, and things like marriage-age laws would become more like socially enforced guidelines.
I wouldn't encourage 40yr olds to marry 15yr olds (unless they're war-brides or something - then it's up to the warrior's discretion).
But in the rare case that two 14yr olds wish to marry, and their fathers don't object, then I wouldn't stand in their way, nor should the law.